Jim, who according to reports has filed for divorce from Meghan, called accusations that he'd slept with the nanny “disgusting and irresponsible” in a lengthy post to his Instagram.

“It’s one thing to be accused of something. It’s another thing to be so negligent and so careless, and ruin the lives of innocent young people,” the 49-year-old sports broadcaster wrote.

Jim and Meghan are heading for divorce

Instagram

“I did not sleep with our nanny. She’s not just a nanny, she is someone that we brought into our house and promised to protect and look after while she was in our home. We have been treating and raising this young girl like she is our own child!”

“For someone to accuse me of sleeping with her is not only wrong, it’s disgusting and irresponsible,” he added.

“Just because I am an athlete and I was portrayed as a bad person on bravo TV. Doesn’t mean I don't have a clue what life is all about. We made a promise to that young girls mom, that We would take care of her and make sure that she was safe while she was in our hands.”

The couple have been married since 2014

Instagram

Jim continued to vent in his post: “I will not sit here and take this bulls— without fighting back.

"Just because you’re extremely witty and intelligent, and know how to play the Instagram game. Doesn’t give you the right to use that platform to wrongfully accuse.”

“Not only is it irresponsible. It is dangerous and puts my family in harms way,” Jim wrote.

“We all make mistakes. This is not one of those times. My heart is broken for everyone involved. if you get anything out of this post. Get the truth.”

The rumours and allegations come after the couple recently confirmed they were attending counselling while continuing to work on their relationship in the wake of the former MLB player’s sexting scandal earlier this year.